[issue16694] Add pure Python operator module

[Zachary Ware]

Zachary Ware added the comment:

Did not know that about test discovery, thank you Éric.  Fixed in v6.

A few other test modules may need the same fix; I based my changes to Lib/test/test_operator.py on Lib/test/test_heapq.py which has the same issue.  I'll open a new report for it and any others I find.

Also, this patch was created with `hg diff -g`; the operator.c rename should be well taken care of by this patch.

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Added file: http://bugs.python.org/file28391/py_operator.v6.diff

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